Knife-sharpener.



v e. B. N.-DOW & 1. F. CAVANAUGH.

KNIFE SHARPENER.

ICATION FILED 7 AP m5. 1,142,030. Patented June 8, 1915..

GEORGE urea.

B. N. DOV] AND JAMES F. CAVANAUGH, 0F MANCHESTER, NEW HAMPSHIRE.

KNIFE-SHABFENER.

To all whom it may Concern 3e it known that we, GEORGE E. N. Dow and JAMES F. CAVANAUGH, citizens of the United States, residing at Manchester, in the county of Hillsboro, State of New Hampshire, have invented a new and useful Knife- Sharpener, of which the following is a speci- .tication.

The device forming the subject matter of this application is adapted to be employed for sharpening scissors, shears and like instruments.

. The invention aims to provide a device of the sort above mentioned in which a pair of crossed blades may be moved longitudinally on each other, thereby to cause successive portions of the longitudinal edges of the blades to define the apex of the sharpening notch, thus materially, lengthening the effective life of the blades.

Another object of the invention is to provide, in a device of the class described, an element which acts at once as a support and as a stop, limiting the movement of the blades when the blades are employed for sharpening shears.

It is within the scope of the invention to improve generally and to enhance the utility of devices of that type to which the present invention appertains.

With the above and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in, the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed, without departing from the spirit of the invention.

In the accompanying drawings: Figure 1 shows the invention in plan, the blades be ing in the positions which they will assume when a knife is to be sharpened; Fig. 2 is a. similar view showing the blades in the positions which they will assume when a pair of shears is to be sharpened; Fig. 3 is a plan showing the opposite side of the structure from that delineated in Figs. 1 and 2, the blades being set for knife sharpening purposes; Fig. 4: is a plan similar to Fig. 3 but showing the blades in the positions which they will occupy when the structure is employed for sharpening a pair of shears; Fig. 5 is an elevation in which the device is viewed edgewise; Fig. 6 is an end elevation Specification of Letters Patent.

Patented June 8, 1915.

' Serial No. 8,840.

showing the structure in the position it will assume in use; Fig. 7 is a plan disclosing one of the blades.

The structure forming the subject matter of this application preferably is fashioned from metal throughout and includes a body, the body comprising a handle 1, and a head 2 of approximately circular contour. The handle 1 is offset from'the plane defined by the head 2, as shown at 4, and a support 3 extends preferably at right angles to the head 2, the construction being such that, as will be evident from Fig. 5, the support 3, the extremity of the handle 1 and a portion of the periphery of the head 2, when in contact with a supporting surface 5 of any desired sort will give a three point bearing. 7

In the periphery of the head 2 opposed notches 6, used for sharpening knives, the notches 6 being referred to hereinafter as knife notches. In the periphery of the head 2 and relatively near to the support 3 are formed notches 7 employed for sharpening shears, the notches 7 being designated as shears notches. Extended through the head 2 adjacent its geometrical center is a securing device preferably in the form of a bolt 8 carrying a wing nut 9. The bolt 8 may be provided with one or more washers 10. A pair of superposed blades 11 are disposed between the washers 10 and the head 2. The blades 11 are equipped with longitudinal slots 12 through which the bolt 8 passes, and the wing nut 9 cooperates with the uppermost blade 11. For a purpose to be described hereinafter, the support 3 is equipped relatively near to the head 2 with transverse notches defining transverse shoulders 1 1.

In practical operation, the blades may be set in crossed relation, as shown in ig. 1, the edges of the blades defining sharpening notches located adjacent the knife notches 6. When the parts are thus arranged and whenthe device is set up on the surface 5 as shown in Fig. 6, a knife blade may be sharpened by sawing the same back and forth in the sharpening notch defined by the edges of the blades 11. Especial attention is directed to the fact that the blades 11 are provided with elongated slots 12 through which the securing bolt 8 passes. Owing to this construction, the blades may be shifted longitudinally, and thus successive portions of the longitudinaledges of are formed with each other notch. In'this manner, and owing to the shoulders 14,

v pivot bolt 8 the blades may be brought into cooperation to define the sharpening fact that the blades 11 have a longitudinal movement for adjustment, the efi'ective life of the blades may be increased materially as will be obvious.

When it is desired to sharpen a pair of shears, one or both of the blades 11 are swung on the clamping'bolt 8 until the inner edges of the blades at one end of the blades abut against the stop 3. Under such circum stances, the sharpening edges of the blades 11 will be located adjacent the shears notches 7 as will be understood clearly from Fig. 2. Then, a pair ofshears may be sharpened by drawlng one of the blades through the notch 7, the edge of the blade of the shears being cut away by the adjacent edge of one of the cutting elements 11. The support 3 exercises a double function in that, as its name indicates, it serves to uphold the structure when the same is disposed as shown in Fig. 6. Further,'as hereinbefore indicated, the support 3 acts as a stop serving to position the blades 11 erly with respect to the shears notches 7.

When the blades are in cooperationwith the support 3, as hereinbefore described, one blade rests upon one of the transverse shoulders l4 and this blade supports the blade thereabove. Owing to the presence of the an undue strain on the blades in the direction of the arrow A in F ig.'5 is prevented and the strain on the clamping'or is reduced accordingly. The support 3 exercises a third function, there- Gopics of this patent may beobtained for five cents each, by

fore, and it tends to prevent any movement of the blades 11 in the direction of the arrow A.

Having thus described the invention, what is claimed is 1. A sharpener of the class described comprising a head having a notch, and a support projecting from the head; a pair of'crossed blades pivoted to the head, the blades being movable to cause their edges to define a sharpening notch, one blade be ing movable to cooperate with the notch in the head, the support engaging the said blade to act as a stop therefor when the said blade is in cooperating relation to the notch in the head.

2. A sharpener of the class described comprising a head having a notch, and a support projecting from the head; a pair of crossed blades pivoted to the head, the blades being movable to cause their edges to define a sharpening notch, one blade being movable to cooperate with the notch in the head, and the support engaging the said blade to act as a stop therefor while the said blade is in cooperating relation to the notch in the head, the support having a transverse shoulder engaging one blade thereby to support the said blade and the superposed blade. 7 v

In testimony that we claim the foregoing as our own, we have hereto affixed our signatures.

GEORGE B. N. DOW. JAMES F. CAVANAUGH. Witness:

PATRICK J. GILMARTIN.

Washingtoml). G.

addressing the Commissioner of Patents, 

